How to reference an object inside itself?
As you can see below I'm creating an unnamed object inside the console.log
console.log({ x: 2, y: this.x * 2, }); I'm not assigning it to any variable.
So I want a way to access it's property x inside itself like calling this.x.
However the above approach is not working.
I'm getting a NAN error.
NOTE I don't want it to assign to a variable/ create using a function constructor/ prototype.
You could write y with a getter method:
The
getsyntax binds an object property to a function that will be called when that property is looked up.
console.log({ x: 2, get y() { return this.x * 2 }, });
var obj = { x: 2, get y() { return this.x * 2 }}; Then call it: obj[y]
You could set your initial property first, and then the property that references it later:
const obj = {'x':2}; obj.y = obj.x*2; console.log(obj);
x is going to be as you're initializing it, then make y the value of 2 times that, without referencing x.Just create a function that will take the first object as first arg and a callback in the second, then in the callback you would work on the things you set, return what you want, and merge it back to the original object.
console.log(mergeFunction({ x: 2 }, (o) => { return { y: o.x * 2 }} })); Not pretty, but likely the best you can do if you want it in "one go".
You get to implement mergeFunction yourself.
2If it's a variable, use the variable